High-mounted intake trumpet injectors were used from day 1 on the pure racing MFI engines using the 'tossel-head' plastic injection lines ... look at the mid-late '60s pics of the MFI 771 [flat-8] engines, 906E, 910, 907, 908, & 917 engines!
Production 911 MFI and early 2.8 RSR engines didn't seem to lose anything from having the in-head injector mounting, and certainly the low & part-throttle responsiveness of those MFI engines isn't matched by anything in production since!
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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